Sun Microsystems Server X4-2, Руководство по установке

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12 Sun Server X4-2 Installation Guide • February 2014
Related Information
■
“Ventilation and Cooling” on page 13
Temperature Guidelines
An ambient temperature range of 21
°
to 23
°
Celsius (70
°
to 74
°
Fahrenheit) is optimal
for server reliability and operator comfort. Most computer equipment can operate in
a wide temperature range, but near 22
°
Celsius (72
°
Fahrenheit) is desirable because
it is easier to maintain safe humidity levels. Operating in this temperature range
provides a safety buffer in the event that the air conditioning system goes down for a
period of time.
Studies have shown that temperature increases of 10
°
Celsius (15
°
Fahrenheit) above
20
°
Celsius (70
°
Fahrenheit) reduce long-term electronics reliability by 50 percent.
Excessive internal temperatures might result in full or partial shutdown of the Sun
Server X4-2.
Humidity Guidelines
Relative humidity is the percentage of the total water vapor that can exist in the air
without condensing, and is inversely proportional to air temperature. Humidity goes
down when the temperature rises, and goes up when the temperature drops. For
example, air with a relative humidity of 45 percent at a temperature of 24
°
Celsius
(75
°
Fahrenheit) has a relative humidity of 65 percent at a temperature of 18
°
Celsius
(64
°
Fahrenheit). As the temperature drops, the relative humidity rises to more than
65 percent, and water droplets are formed.
The ambient relative humidity range of 45 to 50 percent is suitable for safe data
processing operations. Most computer equipment can operate in a wide range (20 to
80 percent), but the range of 45 to 50 percent is recommended for the following
reasons:
■
Optimal range helps protect computer systems from corrosion problems
associated with high humidity levels.
■
Optimal range provides the greatest operating time buffer in the event of air
conditioner control failure.
■
This range helps to avoid failures or temporary malfunctions caused by
intermittent interference from static discharges that may occur when relative
humidity is too low.